OK so here we go. 
Made some templates of the windows from thin card, to allow me to make frames for each of the windows. Used blue tack to hold the styrene in place.
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Some of the finished windows.
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I then wanted to recreate a representation of wood lath and plaster for the ceilings. I cut very thin strips of balsa and pushed them into a thin layer of builders caulk and pva mix that I had spread onto a sheet of paper.
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After the sheet had dried I gave the upper surface several washes of black to age it.
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I also added wall paper to the downstairs, and repainted the wooden skirting boards and door surround a dark mahogany colour. I also added a floor surface to the down stairs. The door was added to the under stairs cupboard as well as adding a coat hanging rack to the wall inside.
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Bid a bit more dry brushing to the outside, windows in place.
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Still loads to do. 
Did a bit more dry brushing of the corrugated sheets, and reshaped them as they had gone a bit flat.
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That's all for now folks.
BB.
Any comments are help full.